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fs: Separate out kiocb flags setup based on RWF_* flags 

Also added RWF_SUPPORTED to encompass all flags.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
hifive-unleashed-5.1
Goldwyn Rodrigues 2017-06-20 07:05:40 -05:00 committed by Jens Axboe
parent 443bd90f2c
commit fdd2f5b7de
3 changed files with 19 additions and 9 deletions
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12
fs/read_write.c
View File

@ -678,16 +678,10 @@ static ssize_t do_iter_readv_writev(struct file *filp, struct iov_iter *iter,
struct kiocb kiocb;
ssize_t ret;
if (flags & ~(RWF_HIPRI | RWF_DSYNC | RWF_SYNC))
return -EOPNOTSUPP;
init_sync_kiocb(&kiocb, filp);
if (flags & RWF_HIPRI)
kiocb.ki_flags |= IOCB_HIPRI;
if (flags & RWF_DSYNC)
kiocb.ki_flags |= IOCB_DSYNC;
if (flags & RWF_SYNC)
kiocb.ki_flags |= (IOCB_DSYNC | IOCB_SYNC);
ret = kiocb_set_rw_flags(&kiocb, flags);
if (ret)
return ret;
kiocb.ki_pos = *ppos;
if (type == READ)

14
include/linux/fs.h
View File

@ -3057,6 +3057,20 @@ static inline int iocb_flags(struct file *file)
return res;
}
static inline int kiocb_set_rw_flags(struct kiocb *ki, int flags)
{
if (unlikely(flags & ~RWF_SUPPORTED))
return -EOPNOTSUPP;
if (flags & RWF_HIPRI)
ki->ki_flags |= IOCB_HIPRI;
if (flags & RWF_DSYNC)
ki->ki_flags |= IOCB_DSYNC;
if (flags & RWF_SYNC)
ki->ki_flags |= (IOCB_DSYNC | IOCB_SYNC);
return 0;
}
static inline ino_t parent_ino(struct dentry *dentry)
{
ino_t res;

2
include/uapi/linux/fs.h
View File

@ -361,4 +361,6 @@ struct fscrypt_key {
#define RWF_DSYNC 0x00000002 /* per-IO O_DSYNC */
#define RWF_SYNC 0x00000004 /* per-IO O_SYNC */
#define RWF_SUPPORTED (RWF_HIPRI | RWF_DSYNC | RWF_SYNC)
#endif /* _UAPI_LINUX_FS_H */